Checklist:

• I have read and followed the contribution guidelines.
• I have read and followed the how to open a pull request guide.
• My pull request targets the main branch of freeCodeCamp.
• I have tested these changes either locally on my machine, or GitHub Codespaces.

What

getScrollbarWidth in client/src/utils/scrollbar-width.ts is meant to sanitize the persisted Monaco scrollbar width to the 5-25 range, but the guard uses ||:

return storedWidth >= 5 || storedWidth <= 25 ? storedWidth : 5;

Every number is either >= 5 or <= 25, so the condition is a tautology and the fallback is only reachable for undefined/NaN. A corrupted or hand-edited monacoScrollbarWidth in localStorage (0, 100, -3) is applied verbatim to the editor: editor.tsx feeds this value into Monaco's verticalScrollbarSize/arrowSize and a width calculation in four places.

The condition wants &&. One character, plus a unit test file so the range check cannot regress silently again (the bug shipped with the original feature PR #49975 and was never caught because the file had no tests).

Verification

scrollbar-width.test.ts covers in-range passthrough, both out-of-range sides, and the unset case, with store mocked. All 4 pass with the fix. Reverting only scrollbar-width.ts fails exactly the two out-of-range tests (expected +0 to be 5, expected 100 to be 5), so the tests isolate the change.

Opened directly without an issue per the contributing FAQ guidance for small self-contained fixes; happy to open one if preferred.